Sewing machine



Feb. 25, 1930. R. K..HOHMANN 1,748,479v

SEWING MACHINE Filed Jan. 24, 192 [sheets-sheet 1 lNV N OR I I MM Wa Y CM W HIS ATTORNEY Feb. 25, 1930. HOHMANN 1,748,479

SEWING MACHINE Filed Jan. 24. 1928 2 Sheets-Sheet 2 O- xx HIS ATTORNEY i INVENTO? 2 BY I Patented Feb. 25', 1930 e .eoMPAiIY,-on1\mw YQ K NL oonronA'rron on NEW, YORK M 1 isiiwme MACHINE Application filedlJ'anuary fl, 1925. Serial no. 243,992

,' 'My'invention relates to sewing maohinesof 7 the rotary shuttle, type in whichthe 'shuttle of the adjacent or associated parts, but-in the Y '3- 7 event of breakageof the thread, or of the loose i end being drawn beneath the work at the commencement of the sewing operation," or of the' th'r'ead being unduly slack through imiproper tensioningj or other-(cause, it f'isfi liable to-be-"drawn into the race-way'by the shuttle 1 'ands'ointerfere with the stitching operation the th're'adnnder some ofthese circumstances .7 becomingso tig'htly wedged betweentheshut tle and race-way wallfas tonece'ssita'telthe' removal of theshuttle from its race-way preliminary to continuing the sewing operation.

object of my present-invention to provide a is mounted for rotation or osoil1ation}in -a race-wayfornied within suitable frame or r I casement at theunder side of the. sewing inachine bed-plate. Such casement is usually" ,formed-with'a'n opening intersecting the racewayl fo'r the passage of theneedle in its reciprocations and to permit of the-.,;thread loop thrown "out bythe needle to be engaged by theshuttle point in the stitch forming opera-j tion; I WVhen the threadloop is engagedby the shuttle point, it is carriedbyithe latter around thebobbin containedwithin'the' shuttle so as to interlok with theunde'r or bobbin thread; inithe formation of .aij stitch inwell known manner. I Inthe normal operationof them'achine, including the proper tensioning of the 3 thread, the needle-thread loop is carried about} the shuttle and'contained bobbin without undue obstruction by or-interference with any With 'the foregoing in mind, it has been the simple and eiiioient meianslforjso controlling l the, thread during its initial engageinent by the" shuttle in the space between? the needle.

and the mouth of -the.rac'e'way" as to prevent] itsfbeingdrawn into the;latter, This-lobjeot Ifaccomplish, ina preferred form o i-my ;in-

1 whereby the thread ,willbe prevented ifrom ventioii, by the provision of a thread guide formed and v positioned. to lenter the {needle 7 thread; loop as it is .earried forwardby'the vshut e n "defl c the Sides} ereof l e al y beyond the sides of therace-way at its mouth,

vention; the feed device bein'g'omitted-for the better showing of the adjacent parts;

needle" "in ngsof a sewing machine equipped" with my in-.,

' Fig. 2 is aplan-view from the upper-side of the bed plate, with the needle or throat plate removed, showing the needle-thread loop engaged by the thread guide for defied the shuttle race-way PATENT OFFICE i; 1 em iei i [K mum, OF F K J T YORK, Assielioliwoi 1 Reierring n 'ow'totheaccompanying 7 an: I tion thereby to opposite sides of the mouth-of r Fig.3 is a view similar to Fig. 1,'with'th'e I "shuttle shown at a diiierent'pointin its rotawith the shuttle removed from its racekway to better show the position of thethre'adguidel relative-to the mouth of the race wayL In this Vl8W-' the needle or throat plate is'{ also re? moved. i

Fig. 4 is ase'ction on'line 4-4 of Fig. 3,-but l Fig; 5 is a detail, inflperspeotive, showing" the thread loop engaged-by the s'hutt'lepoint g hie d guidejenten v The sewlng machine hereinillustrated as" and comprises'thebedplate 1, the reciproe Gat ng needle 2, the rotary sl1uttle3 withitfs peripheral guide flange 4, the frame rease? equipped with my invention is thejwell known Standard rotary *shuttle imachine,

ment 5 withits circular'race-way 6 inwhich j the guide flange 4 of the shuttleis seated ior the 'support'andguidance zofflthe shuttlein its operation, and the bobbin-case 7 mountediwithin the shuttle on Y the central *The casement-'5isprovidedat its upper side. withv a transversely arranged opening 's'tud or s'pindle 8 therein; these several parts I d i be ng of usual'constructiono and operation.f I, 901 I 10 intersecting the shuttle "raceway, which opening, ordinarily termed the needle opening., provides "space for the passage of the; needle in its reciprocatlonsand also for the throwing outof thethreadloop bysaid' shuttle. 1 -1 ipojsition to "be engaged I the I In the operation-of the machine, th "ned1e;

1 in its ascent, throws out a.-thread" 1oop t which is engaged by the point 12 of the shuttle and carried thereby around the bobbin to its point of castpfi", where it is drawn up by the take-up (not shown) into interlocking engagement with the bobbin-thread in usual manner. In the normal or proper operation of the machine, the thread loop, upon its engagement by the shuttle, is carried thereby in' a path which extends below the mouth or entrance 14 of the race-way, as shown in Figs. 1 and 2, wherebyany possibility of the thread becoming drawn into the race-way at such point is avoided. 7 stated, however, if the loose end of the thread becomes drawn beneath the work at the commencement of the stitching-operation, or the thread becomes unduly slack or broken, it-is liable to be drawn into the mouth of the raceway by the advancing shuttle point 12 and so clog the race-way as to prevent the proper operation of the shuttle and consequently of the machine. To avoid possibility of this, I provide a guide member 15, preferably in the form of a wedge, which is positioned with its wide'or base end above and adjacent the mouth of the race-way, and with its point projecting rearwardly towards the path of' the needle in position to enter the thread loop as the latter is carried forward by the shuttle,

flector 15 thus constitutes a very simple'and' eifective means for avoiding clogging of the shuttle race-way by the thread, by preventing possibility of the thread becoming drawn into the said race-way. l r i v V The device 15 may be supported'in position in any suitable or desired way. As here.

shown, it is provided with an attaching shank 16 by means of which it is removably secured on the upper side of the race-way casement by a fastening screw 17. f

What I claim is: p r

1. In a rotary shuttle sewing machine, the combination with the stitching'mechanism comprising a reciprocating needle, a rotary shuttle,,and a casement having 'a circular race-way in whichthe shuttle is supported for operation, said casement having an opening lntersecting its race-way for the passage of the needle, and the front Wall of said open-1 ing containing the mouth of the race-way being spaced substantially in advance of the path of the needle, of athread guide formed and positioned to enter the needle thread loop as it is-carried forward'by the shuttleand deflectithe sides thereof laterallybeyond the As .hereinbefore for operation, said casement having an opening lntersecting its race-way for the passage of'the needle andthefrontwall of'said'open ing containing the mouth of the race-way beingfspaced substantially in advance of the path of the needle, of a wedge-shaped thread guide positioned to enter the needle thread loop .as itis carried forward by the shuttle and deflect the sides. thereof laterally beyond the sidesof the race-way before reaching the mo'uthofthe latter, for the purpose set forth. v

3. In a rotary shuttle sewing machine, the combination .with thestitching mechanism comprising a reciprocating needle, a rotary shuttle, and a casement having a circular race-way in which the shuttle is supported. for. operation, said casement having an opening intersecting its race-Way for'the passage of the needle and the front wallofsaid opening containing the mouth of the race-waybeing spaced substantially in'advance of the path of the needle, of a thread guide eXtend-' ing from the mouth of the race-way towards the path of the needle and formed to enter theneedle thread-loop as it is carried forward by the shuttle and 'deflectthe sides thereof laterally beyond the sides of the race-way be-- fore reaching themouth of the latter, for the purpose set forth.

4; In a rotary shuttle sewing machine, the,

. combination with the stitohingmechanism comprising a reciprocating needle, a rotary shuttle, anda casement having a circular race-way in which the shuttle is supported for operation, said casement having an open. ing intersecting its race-way for the passage of the needle andthe front wall ofsaid open ing containing the mouth of the-race way be-- ing spaced substantially in advance of the path ofith'eneedle, of a wedge-shaped thread guide supported on the easement in position extending from the mouth oft-he race-way'towards the path of the needle and" operative to enterthe needle thread loop as it. is carried forward by thev shuttle and deflect the sides thereof laterally beyond the sides of the. race-way before reaching the mouth of the. latter, for thepurpose set forth. i

5. Ina rotary shuttle sewing machine, the combination with the stitching 'mechanism. comprising a reciprocating needle, a rotary shuttle; and a casement'having a circular race-way. in'which'the shuttle is supported for operation, saidcasement having an opening intersecting its race-way for the passage of the needle and the front wall of said open ing containingthe mouth of the race-waybee ing spaced substantiallyinadvanceof thepath:

' l of the needle, of a thread guidje're movably 7 mounted on said casement and formed and positioned to enter the-needle thread loop as it is carried forward by the shuttle anddefiect the s-idesthereof laterally beyond; the sides of the vrace-Way before 'reachingthe .mouth of the latter, for the purposeset forth. 6. Ina rotary shuttle sewing machine, the combination with the stitching mechanism comprising a reciprocating needle, a rotary shuttle, and a casement having a circular race-way in which the shuttle is supported for operation, said casement having an openingdntersecting its raceway for'the passage of the needleand thefront allof said opening containing the mouth of the race-way 3 being spaced substantially' in advance of the path of theneedle,-ofa thread guide, extenda I ing from the mouth of the race-way rear-v 20 wardly' towards the needle and being formed to engage the thread carried forward by the shuttle and deflect the same laterally to either I sideiof-thc race-way mouth, a 7 In a rotary shuttle sewing machine, the

25 combination With the stitching mechanism comprising'a reciprocating needle, a rotary shuttle, and a casement having a circular race-way in which the shuttle is supported for operation, said casement having an opena a 5 3;) ing intersecting its race-Way for the passage I ofthe needle and the front wall of said opening containing the mouth of the race-way being spaced substantially in advance of the path of the needle, of a thread guide extending from the mouth ,of the race-way rearwardly towards the needle and being wedgeshaped to engage the thread carried forward,

by the shuttle and deflect the same laterallyi I 'ito-either' side oftherace waymouth. In testimony whereof I affi x'my signature. RICHARD K. HOHMANN'. 

